#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define MAX_LAYER 6

int main()
{
    char ch = 'A';
    for (int i = 1; i <= MAX_LAYER; ++i) {
        for (int j = 1; j <= i; ++j) {
            printf("%c", ch);
            ++ch;
        }
        printf("\n");
    }
    
    return 0;
}